I'm really liking the automated trading site, it's really nice.
My two suggestions so far:
1. Show a feed, or in the queue or something: Which items have sold from your shop.
I knew I'd sold two things, because I had metal in my inventory - but I had to deduce what sold.
2. When creating a trade, would it be possible to create a text filter for the selection?
There are a lot of items and a filter box would make it a lot quicker to select what you want.